Deep-Ocean Iron-60 as a Possible Signature of a Nearby Supernova

Details Deep-Ocean Iron-60 as a Possible Signature of a Nearby Supernova Deep-Ocean Iron-60 as a Possible Signature of a Nearby Supernova

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc...10.4212f&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

Scientific paper

Within the history of the earth, it is very likely that one or more supernova explosions occurred nearby ( tens of pc). Events at this distance produce a host of radioactive nuclei and deposit them on the earth, via enhanced cosmogenic processes as well as by passage of the nucleosynthesisenriched supernova blast wave into the solar system. Recently, live 60 Fe (t1/2 = 1.5 Myr) has been detected in a deep-ocean ferromanganese crust. It is shown that the observed signal appears to be two orders of magnitude above known backgrounds (pre-dominantly cosmogenic 60 Fe in dust accreted by the earth). If the detection is interpreted as a signature of a supernova, the event would have occurred within the last 5 Myr, at a distance 30 pc. Future tests of this scenario are brie y discussed.

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